Question about Proform Pro-Form 520 ZN Treadmill

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Squeaking while running when set to a low incline.

When the tread mill is set to a level 2 or 3 incline with every foot fall there is loud squeaking that seems to be coming from the hinges where it connects to the base. I noticed there is what looks like a thick plastic washer at the joints, and I can see a bolt with a nylock nut. Could the nut be loose and that cause the squeaking? I can only see the end of the bolt with the thread and the nut, I can't see the head so I do not know how to tighten it.

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L Pfaff

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Tighten the bolt if loose, yes it could squeak.

Posted on Jan 18, 2016


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